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SET GLOBAL innodb_adaptive_hash_index_cells may be executed while the server is running. This parameter will be effectively multiplied by innodb_adaptive_hash_index_parts, because each partition will contain its own hash table. Previously, the number of hash table cells in the InnoDB adaptive hash index depended on the initial innodb_buffer_pool_size and was insufficient for some workloads, leading to excessively long hash bucket chains. If innodb_adaptive_hash_index_cells is at its minimum and default value 16381 at startup, it will be derived from the innodb_buffer_pool_size, for backward compatibility. |
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